function showMenu() {
		//alert(document.getElementById('menu_dropdown').style.display);
		if (document.getElementById('menu_dropdown').style.visibility == 'hidden')
		{document.getElementById('menu_dropdown').style.visibility = 'visible'; 
		document.getElementById('wi').style.height = '495px'; 
		}
		else
		{document.getElementById('menu_dropdown').style.visibility = 'hidden'
		document.getElementById('wi').style.height = '360px'; }
	}
	function onMenu(id_1){

			document.getElementById(id_1).src = "./IMG/menu"+id_1+".png";  
	}
	function offMenu(id_1){
			document.getElementById(id_1).src = "./IMG/menu"+id_1+"_1.png"; 
	}
	

	

var a = [];
for  (var i = 1; i < 14; i++){
a[i]=new Image; a[i].src="./IMG/menu"+i+".png"; 
}